Lake Mansarovar (and nearby Mount Kailash) in Tibet is the region near the origins of three major rivers: the Indus (flows through Pakistan), the Brahmaputra (flows through Tibet, India, and Bangladesh), and the Sutlej (a tributary of the Indus). Leh is in Ladakh, Lhasa is the capital of Tibet, and Shimla is in Himachal Pradesh; none are the source region. Note that the actual glaciers are distinct but near this sacred lake.